Recently, I came across a video and a news report where it has been reported that a man from India has invented a car which uses water as a key fuel component. The car runs on acetylene gas produced by the reaction of water and calcium carbide in the car's fuel tank. The source of the video is this post off Facebook from History TV18.
The claims are too good to be true and I doubt them. However, I do not know much about cars, automobile/mechanical engineering, and chemistry to check the veracity of the claims. How legitimate are the claims? Do they hold any merit?